JEE Main 2016 · 10 Apr · Shift 1 · Physics Q28

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PhysicsSingle correct+4 / -1Question 28 of 90

To determine refractive index of glass slab using a travelling microscope, minimum number of readings required are :

Two

Three

Four

Five

Answer and worked solution

Official answer: B

Three readings: the mark on the base without the slab, the mark seen through the slab, and the top surface of the slab (powder on it). Then $\mu=\frac{\text{real thickness}}{\text{apparent thickness}}$ .

Topics:Vernier callipers and screw gauge Reflection and plane mirrors

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JEE Main 2016 · 10 Apr · Shift 1, Physics question 28